Feeding mechanism for sewing-machines.



H. W. CORNING.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED FEB. 991915.

1,178,055. Patented Apr. 4, 1916.

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I H. w. CORNING. FEEDING MECHANISM FOR SEWING MACHINES.

Patented Apr. 4, 1916.

2 SHEETS-SHEET 2 APPLICATION FILED FEB. 9. I915.

IN I/E/VTOR Hi5 A TTORNEI THE COLUMBIA PLANOGRAPH CO.. WASHINGTON. D. c

HENRY W. CORNING, OF CLEVELAND, OHIO.

FEEDING- MECHANISM FOR SEWING-MACHIN ES.

Specification of Letters Patent.

Patented Apr. 4, 1916.

Application filed February 9, 1915. Serial No. 6,993.

To all whom it may concern:

Be it known that I, HENRY W. CORNING, a

citizen of the United States. and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following is a specification.

My invention has for its object to provide an improved feeding mechanism for sewing machines that will be simple in construction, efficient in operation, and capable of convenient and accurate adjustment for regulating the length of stitch to be made.

T 0 this end, the invention consists in the novel construction, arrangement and combination of parts hereinafter set forth in detail and particularly pointed out in the appended claims.

Referring now to the accompanying drawings forming part of this specification,-Figure 1 is a bottoniplan view of a sewing machine embodying my invention. Fig. 2 is a vertical section on the line 2+2 of Fig. 1, showing the connections from the upper drive shaft to the looper and feed shafts at the under side of the bed-plate, and also showing the feed regulating means adjusted for the minimum length of stitch. Fig. 3 is a detail view corresponding to the lower part of Fig. 2, but showing the feed regulating means adjusted for the maxi mum length of stitch. Fig. 4 is a sectional front end view of the machine, the section being taken on'line 1-1 of Fig. 1.

Similar reference characters designate like parts on the several figures of the drawin s.

lhe frame of the machine comprises the usual bed-plate 1, and its upwardly projecting arm 2. At the under side of the bed-plate 1 is journaled the rotary looper shaft 3, which may be operated from the upper drive shaft 4, by any suitable means. As here shown, said means comprises a pitman lever 5, connecting at its upper end with an actuating crank in the drive shaft and at its lower end engaging a grooved crank 6, on the rear end of the looper shaft as shown.

The feed device is of the so-called fourmotion type and comprises the usual toothed or serrated work-engaging feeddog 7, carried by an arm 8, which is attached to a horizontally arranged crank arm 9, of a rock-bar 10, which latter is suitably journaled between a pair of rock arms 11,11, of a rock-shaft 12, and is provided with a second crank arm 13 having a looped end 14: embracing a cam or eccentric 15, on the rotary looper shaft 8. lVith this means, rotation of said cam or eccentric 15 operates through the arm 13 to impart a rocking movement to the rock-bar 10, which movement of the latter acts through its second arm 9to impart the required vertical or up-and-down movements to the connect ed feed device.

'Horizontal or movement is imparted to the feed device by the rock-shaft 12 acting through its arms 11, 11, which are jointed to the feed device in the manner hereinbefore described. This rock-shaft 12 which is suitably journaled at its ends between lugs 16, 16 on the under side of the bed-plate in a position parallel with the looper shaft, is provided at its rear end with another rock-arm 17, which is adapted to be operated to impart a variable or adjustable movement to the rock-shaft and connecting feed device, by means as follows: A rock-arm 18, pivoted at one end to a stationary support 19, is operated to receive its rocking movement from an eccentric 20 on the upper drive shaft through a connecting eccentric rod 21. -This rockarm 18, which has a fixed range of movement, is arranged in overlappingrelation with the rock-arm 17 of the shaft 12 and has operative connection therewith to rock the same. As here shown, the rock-arm 17 is forked to receive the opposed rock-arm 18, and operative connection between the,

same is effected by means of a pin or roller 22 extending through an elongated slot or forward and backward way 23 in the rock-arm 18 with its opposite ends projecting into elongated grooves or ways 241 in the opposite inner faces of the forked extensions of. the rock-arm 17, as clearly shown in Fig. 1. By shifting the position of said pin 22 lengthwise of the ways in the connecting rock-arms, it will be obvious that an adjustable working stroke may be imparted from the rock-arm 18, termed the actuator rock-arm, to the rockarm 17 and thereby the connected feed device. For instance, if said pin is adjusted to the position shown in Fig. 2, where it is at the extreme outer end of the arm 17 and adjacent the axis of the actuator arm 18. a minimum throw will be imparted to the arm 17 and connected feed device, whereby a short length of stitch will be made; while if said pin is adjusted to the position shown in Fig. 3, where it is at the extreme outer end of the actuator arm 18 and adjacent the axis of the arm 17, a maximum throw will be imparted to the arm 17 and connected feed device, wherebyacorresponding length of stitch will be made. Intermediate adjustments of the pin 22 will of course correspondingly vary the length of stitch. lVith the rock-arms l7 and 18 arranged in overlapping relation as shown, it will be understood that the movement imparted from the rock-arm 18 to the rock-arm 17 is multiplied to a substantial extent by a slight adjustment of the pin 22.

Any suitable means may be employed to adjust the position of the pin 22 lengthwise of the arm 18 for the purpose described. The means employed as here shown comprises a link 25 connecting at one end with said pin and at its opposite end with ausual form of clamp device 26 adjustably fitted to an elongated slot 27 in the bed-plate as shown.

lVhat I claim is z 1. In a sewing machine, the combination with the feed device and means for imparting vertical movement thereto, of means for imparting horizontal movement to said feed device comprising a rock-shaft having an arm jointed to said feed device, a pair of opposed rock-arms each having a longitudinal way therein and one being fixed to said rock-shaft and the other being pivoted to a stationarysupport and serving as an actuator, and one of said rock-arms also being forked to provide an open slot receiving the other, a pin engaging said rock-arms within the ways therein and being adjustable lengthwise of the same whereby an adjustable working stroke'may be imparted from the actuator rock-arm to the feed device, and

means for imparting rocking movement to 7 with the feed device and means for impart-.

ing vertical movement thereto, of means for imparting horizontal movement to said feed device comprising a rock-shaft having an arm jointed to said feed device, a pair of'op posed rock arms each having a longitudinal way therein and one being fixed to said rockshaft and the other being pivoted to a stationary support and serving as an actuator,

and one of said rock-arms also being forked to provide an open slot receiving the other,"

a pin engaging said rock-arms within the ways therein and being adjustable lengthwise of the same whereby an adjustable working stroke may be imparted from the actuator rock-arm to the feed device, a drive shaft having an actuating device, and a vertically reciprocating pitman operated from said actuating device and having a pivotal connection with the actuator rock-arm to impart rocking movement thereto,

4. In a sewing machine, the combination with the feed device and means for impart ing vertical movement thereto, of means for imparting horizontal movement to said feed I device comprising a rock-shaft having an arm jointed to said feed device, a pair of op- L posed rock-arms one being fixed to said rockshaft and the other being'plvoted to a stationary support and serving as an actuator,

and one of said rock-arms having a longitu dinalslot or way and the other being forked to receive the first-named rock-arm and having longitudinal ways in its opposite inner faces, a pin engaging'said rock-arms within the ways therein and being ad ustable lengthwise of the same whereby an adjustable working stroke may be imparted from the actuator rock-arm to the feed device, and means for imparting rocking movement to said actuator r0ck-arm.

Signed at Cleveland, in the county of Cuvahoga, and State of Ohio, this 6th day of February A. D. 1915. r

HENRY W. CORNING.

Witnesses: CHAS. C. EMMoNs,

J. H. WHITE.

Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. 0. 

